Air-cooled chillers with single-screw compressor. Installation, operation and maintenance manual D - KIMAC EN. Original Instructions

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1 Installation, operation and maintenance manual D - KIMAC EN Air-cooled chillers with single-screw compressor EWAD650-C17 C-SS EWAD650-C17 C-SL EWAD620-C16 C-SR EWAD760-C19 C-XS EWAD760-C19 C-XL EWAD740-C19 C-XR EWAD820-C14 C-PS EWAD820-C14 C-PL EWAD810-C14 C-PR 50Hz Refrigerant: R-134 Original Instructions

2 IMPORTANT This manual has been prepared as technical support only. It is not a binding commitment by Daikin. Daikin has drawn it up to the best of their knowledge. No explicit or implicit warranty is provided with regard to the completeness, accuracy and reliability of its content. All data and specifications provided herein are subject to change without notice. All data supplied at the time of order should be taken as reference. Daikin specifically rejects any liability for any direct or indirect damages, in the broadest sense of the term, arising from or related to the use and/or interpretation of this manual. All contents are Daikin copyright protected. WARNING Before starting the installation of the unit, please read this manual carefully. Starting up the unit is absolutely forbidden if all instructions contained in this manual are not clear. Key to symbols Important note. Failure to comply with this instruction may damage the machine or affect its operation. Note concerning safety in general or compliance with laws and regulations Note concerning electrical safety D - KIMAC EN - 2/68

3 Description of the labels applied to the electrical panel 2 compressors unit Label Identification 1 nameplate data 6 Cable tightening warning 2 Lifting instructions 7 Gas type 3 Non flammable gas symbol 8 Manufacturer s logo 4 Emergency stop 9 Electrical hazard symbol 5 Water circuit filling warning 10 - Hazardous Voltage warning 3 compressors unit Label Identification 1 nameplate data 6 Cable tightening warning 2 Lifting instructions 7 Gas type 3 Non flammable gas symbol 8 Manufacturer s logo 4 Emergency stop 9 Electrical hazard symbol 5 Water circuit filling warning 10 - Hazardous Voltage warning D - KIMAC EN - 3/68

4 Contents General information... 6 Receiving the machine... 6 Checks... 6 Purpose of the manual... 6 Warning... 6 Nomenclatura... 7 Technical Specifications EWAD~C-SS & EWAD~C-SL... 8 Technical Specifications EWAD~C-SR Technical Specifications EWAD~C-XS & EWAD~C-XL Technical Specifications EWAD~C-XR Technical Specifications EWAD~C-PR Operating limits Storage Operation Mechanical installation Shipping Responsibility Safety Moving and lifting Positioning and assembly Clearance Sound protection Water piping Water treatment Evaporator and exchangers antifreeze protection Correction coefficients for use of ethylenic glycol Minimum percentage of glycol for low water temperature Minimum percentage of glycol for low ambient temperature Installing the flow switch Hydronic kit (optional) Electrical installation General specifications Electrical components Electrical wiring Electrical heaters Pump electrical supply Water pump control on/off remote control - Electrical wiring Double setpoint - Electrical wiring External water setpoint reset - Electrical wiring (optional) limitation - Electrical wiring (optional) Operation Operator's responsibilities Description of the machine Description of the refrigeration cycle Description of the refrigeration cycle with partial heat recovery Controlling the partial recovery circuit and installation recommendations Compressor Compression process Refrigeration capacity control Pre-startup checks General s with external water pump s with built-in water pump Electrical supply Unbalancing of the voltage supply Electrical heaters power supply Start-up procedure Turning on the machine Seasonal shut-down Start-up after seasonal shut-down System maintenance General Compressor maintenance Lubrication Ordinary maintenance Filter dryer replacement D - KIMAC EN - 4/68

5 Filter dryer cartridge replacement procedure Oil filter replacement Refrigerant charge Refrigerant replenishment procedure Standard checks Temperature and pressure sensors Test sheet Water side measurements Refrigerant side measurements Electrical measurements Service and limited warranty Compulsory routine checks and starting up pressurised devices Important information regarding the refrigerant used Tables Tabella 1 - Nomenclatura serie EWAD~C Table 2 - Acceptable water quality limits Table 3 - Correction coefficients for use of ethylenic glycol Table 4 - Glycol percentages according to ambient temperature Table 5 - Nomenclature of switches Table 6 - Typical operating conditions with compressors at 100% Table 7 - Ordinary maintenance schedule Table 8 - Pressure/Temperature Figures Fig. 1 - Operating field Fig. 2 - Lifting the unit Fig. 3 - Clearance requirements for machine maintenance Fig. 4 - Minimum installation clearance of the individual machine Fig. 5 - Recommended minimum installation clearance Fig. 6 - Water connection Fig. 7 - Adjusting the safety flow switch Fig. 8 - Single and double pump (two pump) hydronic kit Fig. 9 - Installation of long power supply wires Fig User connection tot he interface M3 terminal board Fig refrigeration circuit Fig Refrigeration circuit unit with partial heat recovery Fig Picture of F4AL compressor Fig Compression process Fig Operating layout of load/discharge boxes Fig Installation of F4AL compressor control devices D - KIMAC EN - 5/68

6 General information IMPORTANT The machines described by this manual are an excellent investment. Maximum care should be taken to ensure correct installation and to keep them in good working condition. Correct maintenance of the unit is indispensable for its safety and reliability. Manufacturer s service centres are the only having adequate technical skill for maintenance. ATTENTION This manual describes the features and procedures for the complete series. All units are delivered complete with wiring diagram and dimensional drawings, with size, weight and features of the specific machine. WIRING DIAGRAMS AND DIMENSIONAL DRAWINGS MUST BE CONSIDERED ESSENTIAL DOCUMENTS OF THIS MANUAL. Should there be any discrepancy between this manual and the two aforesaid documents, please refer to the wiring diagram and dimensional diagrams. Receiving the machine The machine must be inspected for any possible damage immediately upon reaching its final place of installation. All components described in the delivery note must be carefully inspected and checked. any damage must be reported to the carrier. Before connecting the machine to earth, check that the model and power supply voltage shown on the nameplate are correct. Responsibility for any damage after acceptance of the machine cannot be attributed to the manufacturer. Checks To prevent the possibility of incomplete delivery (missing parts) or transport damage, please perform the following checks upon receipt of the machine: a) Before accepting the machine, please verify every single component in the consignment. Check for any damage. b) In the event that the machine has been damaged, do not remove the damaged material. A set of photographs are helpful in ascertaining responsibility. c) Immediately report the extent of the damage to the transportation company and request that they inspect the machine. d) Immediately report the extent of the damage to the retailer, so that arrangements can be made for the required repairs. In no case must the damage be repaired before the machine has been inspected by the representative of the transport company. Purpose of the manual The purpose of this manual is to allow the installer and the qualified operator to carry out all required operations in order to ensure proper installation and maintenance of the machine, without any risk to people, animals and/or objects. The manual is an important supporting document for qualified personnel but it is not intended to replace such personnel. All activities must be carried out in compliance with local laws and regulations. Warning This manual has been prepared as technical support only. It is not a binding offer by Daikin. Daikin has drawn it up to the best of their knowledge. No explicit or implicit warranty is provided with regard to the completeness, accuracy and reliability of its content. All data and specifications provided herein are subject to change without notice. Daikin specifically rejects any liability for any direct or indirect damages, in the broadest sense of the term, arising from or related to the use and/or interpretation of this manual. All contents are Daikin copyright protected. D - KIMAC EN - 6/68

7 Nomenclatura E W A D C - S S Machine type EWA = Air-cooled chiller, cooling only EWY = Air-cooled chiller, heat pump EWL = Remote condenser chiller ERA = Air cooled condensing unit EWW = Water-cooled chiller, cooling only EWC = Air-cooled chiller, cooling only with centrifugal fan EWT = Air-cooled chiller, cooling only with heat recovery Refrigerant D = R-134a P = R-407c Q = R-410a Capacity class in kw (Cooling) Approximation of cooling capacity Model series Letter A, B, : major modification Inverter - = Non-inverter Z = Inverter Efficiency level S = Standard efficiency X = High efficiency P = Premium efficiency H = High ambient Sound level L = Low noise S = Standard noise R = Reduced noise X = Extra low noise C = Cabinet Tabella 1 - Nomenclatura serie EWAD~C- D - KIMAC EN - 7/68

8 Technical Specifications EWAD~C-SS & EWAD~C-SL TECHNICAL SPECIFICATIONS EWAD~C-SS & EWAD~C-SL Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Colour Ivory White Material Galvanized and painted steel sheet Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Refrigerant circuit Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 8/68

9 TECHNICAL SPECIFICATIONS EWAD~C-SS & EWAD~C-SL 970 C11 C12 C14 Capacity (1) Cooling kw Stepless Capacity control Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Colour Material Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Refrigerant type Refrigerant circuit Refrigerant charge Piping connections N. of circuits Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 9/68

10 TECHNICAL SPECIFICATIONS EWAD~C-SS & EWAD~C-SL C15 C16 C17 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Refrigerant circuit Colour Material Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 10/68

11 ELECTRICAL SPECIFICATIONS EWAD~C-SS & EWAD~C-SL Power Supply Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Phase No Voltage V Compressor Voltage Tolerance Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% Maximum running current A Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-SS & EWAD~C-SL 970 C11 C12 C14 Power Supply Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Maximum current for wires sizing Phase Voltage Voltage Tolerance Maximum running current Starting method No V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-SS & EWAD~C-SL C15 C16 C17 Power Supply Hz V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A A A A Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Maximum current for wires sizing Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) Notes Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%. Maximum starting current: starting current of biggest compressor + current of the compressor at 75% maximum load + fans current for the circuit at 75%. Nominal current in cooling mode is referred to the following conditions: evaporator 12 C/7 C; ambient 35 C; compressors + fans current. Maximum running current is based on max compressor absorbed current in its envelope and max fans absorbed current Maximum unit current for wires sizing is based on minimum allowed voltage Maximum current for wires sizing: (compressors full load ampere + fans current) x 1,1. D - KIMAC EN - 11/68

12 Technical Specifications EWAD~C-SR TECHNICAL SPECIFICATIONS EWAD~C-SR Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Colour Ivory White Material Galvanized and painted steel sheet Dimensions Weight (EWAD~C-SR) Water heat exchanger Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 12/68

13 TECHNICAL SPECIFICATIONS EWAD~C-SR 920 C10 C11 C13 Capacity (1) Cooling kw Stepless Capacity control Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SR) Water heat exchanger Colour Material Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Drive Diameter Nominal air flow Model Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Compressor Oil charge Quantity Sound level (EWAD~C-SR) Sound Power Sound Pressure (2) Refrigerant type Refrigerant circuit Refrigerant charge N. of circuits Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 13/68

14 TECHNICAL SPECIFICATIONS EWAD~C-SR C14 C15 C16 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SR) Water heat exchanger Colour Material Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 14/68

15 ELECTRICAL SPECIFICATIONS EWAD~C-SR Power Supply Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-SR 920 C10 C11 C13 Power Supply Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-SR C14 C15 C16 Power Supply Hz V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) Notes Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%. Maximum starting current: starting current of biggest compressor + current of the compressor at 75% maximum load + fans current for the circuit at 75%. Nominal current in cooling mode is referred to the following conditions: evaporator 12 C/7 C; ambient 35 C; compressors + fans current. Maximum running current is based on max compressor absorbed current in its envelope and max fans absorbed current Maximum unit current for wires sizing is based on minimum allowed voltage Maximum current for wires sizing: (compressors full load ampere + fans current) x 1,1. D - KIMAC EN - 15/68

16 Technical Specifications EWAD~C-XS & EWAD~C-XL TECHNICAL SPECIFICATIONS EWAD~C-XS & EWAD~C-XL C10 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Colour Ivory White Material Galvanized and painted steel sheet Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Refrigerant circuit Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler mm Direct propeller type DOL l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. Notes (2) The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 16/68

17 TECHNICAL SPECIFICATIONS EWAD~C-XS & EWAD~C-XL C11 C12 C13 C14 C15 Capacity (1) Cooling kw Stepless Capacity control Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Colour Material Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Drive Diameter Nominal air flow Model Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler mm Direct propeller type DOL l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a R-134a kg No Compressor Oil charge Quantity Sound level (EWAD~C-SS) Sound Power Sound Pressure (2) Sound level (EWAD~C-SL) Sound Power Sound Pressure (2) Refrigerant type Refrigerant circuit Refrigerant charge N. of circuits Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. Notes (2) The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 17/68

18 TECHNICAL SPECIFICATIONS EWAD~C-XS & EWAD~C-XL C16 C17 C18 C19 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Colour Material Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Refrigerant circuit Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Ivory White Galvanized and painted steel sheet Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 18/68

19 ELECTRICAL SPECIFICATIONS EWAD~C-XS & EWAD~C-XL C10 Power Supply Phase Frequency Voltage Voltage Tolerance Hz V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A A A A Maximum starting current Nominal running current cooling Maximum running current Maximum current for wires sizing Fans Nominal running current in cooling A Phase No Voltage V Compressor Voltage Tolerance Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% Maximum running current A Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-XS & EWAD~C-XL C11 C12 C13 C14 C15 Power Supply Hz V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A A A A Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Maximum current for wires sizing Phase Voltage Voltage Tolerance Maximum running current Starting method No V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-XS & EWAD~C-XL C16 C17 C18 C19 Power Supply Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Maximum current for wires sizing Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Fans Nominal running current in cooling A Phase No Voltage V Compressor Voltage Tolerance Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% Maximum running current A Starting method Wye Delta type (Y Δ) Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%. Maximum starting current: starting current of biggest compressor + current of the compressor at 75% maximum load + fans current for the circuit at 75%. Notes Nominal current in cooling mode is referred to the following conditions: evaporator 12 C/7 C; ambient 35 C; compressors + fans current. Maximum running current is based on max compressor absorbed current in its envelope and max fans absorbed current Maximum unit current for wires sizing is based on minimum allowed voltage Maximum current for wires sizing: (compressors full load ampere + fans current) x 1,1. D - KIMAC EN - 19/68

20 Technical Specifications EWAD~C-XR TECHNICAL SPECIFICATIONS EWAD~C-XR C10 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Colour Ivory White Material Galvanized and painted steel sheet Dimensions Weight (EWAD~C-SR) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler mm Direct propeller type DOL l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 20/68

21 TECHNICAL SPECIFICATIONS EWAD~C-XR C11 C12 C13 C14 C15 Capacity (1) Cooling kw Stepless Capacity control Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SR) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Colour Material Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler mm Direct propeller type DOL l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 21/68

22 TECHNICAL SPECIFICATIONS EWAD~C-XR C16 C17 C18 C19 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SR) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Colour Material Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell Ivory White Galvanized and painted steel sheet High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 22/68

23 ELECTRICAL SPECIFICATIONS EWAD~C-XR C10 Power Supply Hz V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-XR C11 C12 C13 C14 C15 Power Supply Hz V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% -10% Maximum % +10% +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-XR C16 C17 C18 C19 Power Supply Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%. Maximum starting current: starting current of biggest compressor + current of the compressor at 75% maximum load + fans current for the circuit at 75%. Notes Nominal current in cooling mode is referred to the following conditions: evaporator 12 C/7 C; ambient 35 C; compressors + fans current. Maximum running current is based on max compressor absorbed current in its envelope and max fans absorbed current Maximum unit current for wires sizing is based on minimum allowed voltage Maximum current for wires sizing: (compressors full load ampere + fans current) x 1,1. D - KIMAC EN - 23/68

24 Technical Specifications EWAD~C-PS & EWAD~C-PL TECHNICAL SPECIFICATIONS EWAD~C-PS & EWAD~C-PL C11 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Colour Ivory White Material Galvanized and painted steel sheet Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Refrigerant circuit Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 24/68

25 TECHNICAL SPECIFICATIONS EWAD~C-PS & EWAD~C-PL C12 C13 C14 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SS) Weight (EWAD~C-SL) Water heat exchanger Colour Material Operating Weight Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Air heat exchanger Fan Compressor Sound level (EWAD~C-SS) Sound level (EWAD~C-SL) Refrigerant circuit Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) Cooling db(a) Cooling db(a) R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 25/68

26 ELECTRICAL SPECIFICATIONS EWAD~C-PS & EWAD~C-PL C11 Power Supply Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-PS & EWAD~C-PL C12 C13 C14 Power Supply Hz V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) Notes Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%. Maximum starting current: starting current of biggest compressor + current of the compressor at 75% maximum load + fans current for the circuit at 75%. Nominal current in cooling mode is referred to the following conditions: evaporator 12 C/7 C; ambient 35 C; compressors + fans current. Maximum running current is based on max compressor absorbed current in its envelope and max fans absorbed current Maximum unit current for wires sizing is based on minimum allowed voltage Maximum current for wires sizing: (compressors full load ampere + fans current) x 1,1. D - KIMAC EN - 26/68

27 Technical Specifications EWAD~C-PR TECHNICAL SPECIFICATIONS EWAD~C-PR C10 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Colour Ivory White Material Galvanized and painted steel sheet Dimensions Weight (EWAD~C-SR) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 27/68

28 TECHNICAL SPECIFICATIONS EWAD~C-PR C11 C13 C14 Capacity (1) Cooling kw Capacity control Stepless Minimum capacity % power input (1) Cooling kw EER (1) ESEER Casing Dimensions Weight (EWAD~C-SR) Water heat exchanger Air heat exchanger Fan Compressor Sound level (EWAD~C-SR) Refrigerant circuit Colour Material Operating Weight Water volume Nominal water flow rate Nominal Water pressure drop Insulation material Drive Diameter Nominal air flow Model Oil charge Quantity Sound Power Sound Pressure (2) Refrigerant type Refrigerant charge N. of circuits Ivory White Galvanized and painted steel sheet Height mm Width mm Length mm kg kg Single Pass Shell&Tube l Cooling l/s Cooling kpa Closed cell High efficiency fin and tube type with integral subcooler Direct propeller type DOL mm l/s Quantity No Speed rpm Motor input W Semi-hermetic single screw compressor l No Cooling db(a) Cooling db(a) R-134a R-134a R-134a kg No Piping connections Evaporator water inlet/outlet mm Safety devices High discharge pressure (pressure switch) High discharge pressure (pressure transducer) Low suction pressure (pressure transducer) Compressor motor protection High discharge temperature Low oil pressure Low pressure ratio High oil filter pressure drop Phase monitor Emergency stop button Water freeze protection controller Notes (1) Notes (2) Cooling capacity, unit power input in cooling and EER are based on the following conditions: evaporator 12/7 C; ambient 35 C, unit at full load operation. The values are according to ISO 3744 and are referred to: evaporator 12/7 C, ambient 35 C, full load operation. D - KIMAC EN - 28/68

29 ELECTRICAL SPECIFICATIONS EWAD~C-PR C11 Power Supply Hz V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% -10% Maximum % +10% +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) ELECTRICAL SPECIFICATIONS EWAD~C-PR C12 C13 C14 Power Supply Hz V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A A A A Maximum current for wires sizing Fans Nominal running current in cooling A Compressor Phase Frequency Voltage Voltage Tolerance Maximum starting current Nominal running current cooling Maximum running current Phase Voltage Voltage Tolerance No V Minimum % -10% -10% -10% Maximum % +10% +10% +10% A Maximum running current Starting method Wye Delta type (Y Δ) Notes Allowed voltage tolerance ± 10%. Voltage unbalance between phases must be within ± 3%. Maximum starting current: starting current of biggest compressor + current of the compressor at 75% maximum load + fans current for the circuit at 75%. Nominal current in cooling mode is referred to the following conditions: evaporator 12 C/7 C; ambient 35 C; compressors + fans current. Maximum running current is based on max compressor absorbed current in its envelope and max fans absorbed current Maximum unit current for wires sizing is based on minimum allowed voltage Maximum current for wires sizing: (compressors full load ampere + fans current) x 1,1. D - KIMAC EN - 29/68

30 Operating limits Storage The series units can be stored in the following environmental conditions: Minimum ambient temperature : -20 C Maximum ambient temperature : 57 C Maximum RH : 95% not condensing ATTENTION Storage at temperatures below the minimum specified, can damage some parts including the electronic controller and its LCD display. WARNING Storage at temperatures higher than the maximum specified causes the safety valves on the compressor suction line to open. ATTENTION Storage in particularly humid atmospheres can damage the electrical components. Operation operation is permitted within the limits specified in the following diagram. ATTENTION Operation outside these limits can cause the protective devices to intervene and interrupt unit operation. In extreme cases, damage may also be caused. If in doubt, consult the manufacturer. These operating limits apply with the machine running on a full load. Fig. 1 - Operating field Standard Efficiency High Efficiency Premium Efficiency Amb. temp. [ C] Operation with water and glycol In this area, the unit may operate partly. Consult the performance tables. Operation with fan velocity adjustment only (below 10 C Amb. temp.) Operation with fans with Speedtroll only (below 10 C ambient temp.) Evaporator leaving water temperature [ C] D - KIMAC EN - 30/68

31 Mechanical installation Shipping The stability of the machine during shipping must be ensured. If the machine is shipped with a wooden cross-plank on its base, the cross-plank must be removed only after the final destination has been reached. Responsibility The manufacturer declines all responsibility, present and future, for any damage to persons, animals or property caused by negligence of operators failing to follow the installation and maintenance instructions in this manual. All safety equipment must be regularly and periodically checked in accordance with this manual and with local laws and regulations regarding safety and environmental protection. Safety All activities concerning the machine, be they: movement, installation, start-up or maintenance, must in any case comply with all current laws on safety and only be carried out by authorised, qualified personnel. Thus stated, the following are some warnings, although the list is not intended as exhaustive: The machine must be firmly secured to the ground. The machine can only be lifted and moved by correctly using the lifting points on the machine base, marked in yellow. These are the only points that can support the entire weight of the unit, and only if used according to the lifting diagram described in this manual. The machine can only be used safely once it has been firmly secured to the ground or to an equivalent structure. Do not access the electrical components if the machine is not in safe conditions. Do not access the electrical components without having opened the machine's general switch to disconnect the power supply. An insulating platform must be used. Do not access the electrical components if water and/or moisture are present. All operations on the refrigerant circuit and on pressurised components must be carried out by qualified personnel only. Replacement of a compressor or addition of lubricating oil must be carried out by qualified personnel only. Sharp edges and the surfaces of the condensing section, can cause injury. Avoid direct contact. Disconnect the machine's electrical supply by opening the general switch, before working on the cooling fans and/or compressors. Failure to comply with this rule may cause serious personal injury. Avoid introducing solid bodies into the water pipes while the machine is connected to the system. A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet. The filter must have a maximum mesh size of 500 μm. The machine is supplied with safety valves installed on both the high and low pressure sides of the refrigerant gas circuit. In case of sudden stop of the unit, follow the instructions on the Control Panel Operating Manual which is part of the on-board documentation delivered to the end user with this manual. It is recommended to perform installation and maintenance with other people. In case of accidental injury or unease, it is necessary to: - keep calm - press the alarm button if present in the installation site - move the injured person in a warm place far from the unit and in rest position - contact immediately emergency rescue personnel of the building or if the Health Emergency Service - wait without leaving the injured person alone until the rescue operators come - give all necessary information to the the rescue operators WARNING Before carrying out any operation on the machine, please read this instruction and operating manual carefully. Installation and maintenance must be carried out by qualified personnel familiar with the provisions of law and local regulations, and who has been properly trained or has experience with this type of equipment. D - KIMAC EN - 31/68

32 WARNING Avoid installing the machine in a place that could be dangerous during maintenance operations, such as (but not only) platforms without parapets or railings, or areas not complying with the clearance requirements. Moving and lifting The machine must be moved and lifted by using cables, spacing bars and scales of appropriate dimensions to the machine weight. This is stated on its identification plate. The table of weights included in the manual should be considered as indicative only. Installation of certain accessories can increase machine weight. Always refer to the dimensional diagrams supplied for any technical information. Block machine sliding on lorries to prevent damage to the panels and base frame. Avoid bumping, jolting and impacts during unloading and/or moving the machine. Do not push or pull the machine from any part other than the base frame. These falls could cause serious damages for which the manufacturer will not be held liable. All units of the series are supplied with lifting points market in yellow. Only use these points to lift the unit, as shown in the figure. Lifting the unit N.B.: the lifting method specified below if valid for all EWAD-Cmodels Use spacing bars to prevent damage to the condensation bank. Position these above the fan grills at a distance of at least 2.5 metres. Only use the designated lifting points marked on the unit Fig. 2 - Lifting the unit D - KIMAC EN - 32/68

33 WARNING Both the lifting ropes and the spacing bar and/or scales must be sized to support the machine weight safely. Please check the unit's weight on the machine's nameplate. The weights shown in the 'Technical data' tables in the 'General information' chapter refer to standard units, without any added accessories. The specific machine may have accessories that increase its overall weight (pumps, copper banks/copper, etc.). WARNING The machine must be lifted with the utmost attention and care. Avoid jolting when lifting and lift the machine very slowly, keeping it perfectly level. WARNING If the machine is fitted with soundproof cabins for the compressors, remove the side panels at the lifting points to avoid damage and deformation. Positioning and assembly All units are designed for installation outdoors on terraces or the ground, as long as the area is free from obstacles that could limit air flow to the condensation banks. The machine must be installed on a robust and perfectly level foundation. Should the machine be installed on balconies and/or roofs, it may be necessary to use weight distribution beams. For installation on the ground, there must be a robust cement base that is at least 250 mm longer and wider than the machine. Furthermore, this base must be strong enough to support the weight of the machine as stated in the technical specifications. Should the machine be installed in places that are easily accessible to people and animals, it is advisable to install protection gratings for the banks and compressors, and guarantee access to the machine only when in a safe condition. To ensure the best possible performance on the installation site, the following precautions and instructions must be followed: Avoid recirculation of air flow out from the fans towards bank suction. Ensure there are no obstacles obstructing air flow to the banks, guaranteeing correct suction and expulsion. Guarantee a strong, solid foundation to reduce noise and vibration as much as possible. Do not install in particularly dusty environments as this will dirty the condensation banks. The water in the system must be particularly clean and all traces of oil or rust must be removed. A mechanical water filter must be installed on the machine's inlet piping. Clearance Correct machine operation depends on compliance with the minimum clearance requirement for installation, which guarantee correct ventilation of the condensation banks. Reduced installation space could reduce normal air flow, significantly reducing machine performance and increasing the electricity consumed. In determining the correct machine position, consider the following factors: avoid any recirculation of hot air between fans and condensers. Avoid under-supplying the air flow to the condensation banks. Both these conditions can cause the condensation pressure to increase, determining a reduction in energy efficiency and refrigeration capacity (despite the fact that the unit's condenser geometry allows it to partly compensate for poor air distribution, and software is particularly able to calculate machine operating conditions and optimise load in abnormal operating conditions). Machine installation not only guarantees its correct operation, but also allows for all post-installation and maintenance work to be carried out correctly. Figure 8 shows the minimum clearance requirements. If the machine is positioned in a place surrounded by walls or obstacles of the same height as the machine, it must be at least 2500 mm away from these. Should the obstacles be higher, the machine must be at least 3,000 mm away from these. If the machine is installed without complying with these recommended minimum distances from walls and/or vertical obstacles, hot air may re-circulate and/or the air condenser may be under-supplied and this can lead to a loss of efficiency. D - KIMAC EN - 33/68

34 Fig. 3 - Clearance requirements for machine maintenance When two or more machines are positioned side by side, a space of at least 3,600 mm is recommended between the condensation banks. For further solutions, please consult authorised technicians. In any case, the microprocessor will allow the machine to adapt to the new condition, producing maximum capacity available even at side distances of less that the recommended clearance space. Fig. 4 - Minimum installation clearance of the individual machine D - KIMAC EN - 34/68

35 Fig. 5 - Recommended minimum installation clearance ATTENTION The minimum installation clearance spaces described previously are indicative only and not a fundamental requirement. Each installation must be carefully evaluated according to the specific environmental parameters. For example: should you fail to consider dominant wind at the point of installation, this can affect overall machine function, even where the recommended minimum installation clearance spaces are left. Sound protection When sound levels require special control, great care must be exercised to isolate the machine from its base by appropriately applying anti-vibration elements (supplied as an accessory). Flexible joints must be installed on the water connections as well. Water piping ATTENTION Adjust the anti-vibration mountings beneath the machine before connecting the water circuit. Piping must be designed with the lowest number of elbows and the lowest number of vertical changes of direction. In this way, installation costs are reduced considerably and system performance is improved. The water system should have: 1. Anti-vibration mountings in order to reduce transmission of vibrations to the underlying structure. 2. Isolating valves to isolate the machine from the water system during service. 3. Manual or automatic air venting device at the system's highest point. Drain device at the system's lowest point. 4. Neither the evaporator nor the heat recovery device must be positioned at the system's highest point. 5. A suitable device that can maintain the water system under pressure (expansion tank, etc.) and offset temperature changes. 6. Water temperature and pressure indicators on the machine to assist the operator during service and maintenance. 7. A filter or device which can remove foreign particles from the water before it enters the pump (in order to prevent cavitation, please consult the pump manufacturer for the recommended filter type). The use of a filter prolongs the life of the pump and helps keep the water system in better condition. 8. Another filter must be installed on the machine inlet water pipe, near the evaporator and heat recovery (if installed). The filter prevents solid particles from entering the heat exchanger, as they could damage it or reduce its heat exchanging capacity. 9. The shell and tube heat exchanger is fitted with a thermostatic electrical resistance that guarantees protection against water freezing down to external temperatures of -25 C. All other water piping outside the machine must be protected against freezing. To guarantee correct resistance function, the machine must be powered even when not in use. 10. The heat recovery device must be emptied of water during the winter season, unless an appropriate percentage antifreeze mix is added to the water circuit. 11. If the machine is installed to replace another, the entire water system must be emptied and cleaned before the new unit is installed. Regular tests and proper chemical treatment of water are recommended before starting up the new machine. D - KIMAC EN - 35/68

36 12. If an antifreeze is added to the water system, machine performance will be lower and water pressure drops will be greater. All machine protection systems, such as antifreeze, and low-pressure protection will need to be readjusted. Before insulating water piping, check that there are no leaks. EVAPORATOR FLEXIBLE CONNECTOR MECHANICAL FILTER ISOLATING VALVE FLOW SWITCH Fig. 6 - Water connection ATTENTION Install a mechanical filter on the inlet to each heat exchanger. Failure to install a mechanical filter allows solid particles and/or welding slag to enter the exchanger. Installation of a filter with mesh size not exceeding 0.5 mm in diameter, is advised. The manufacturer cannot be held responsible for any damage to exchangers ensuring from the lack of a mechanical filter. Protect all piping from freezing Protect all piping from freezing. ATTENTION Water treatment Before putting the machine into operation, clean the water circuit. Dirt, scaling, corrosion residue and other foreign material can accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drops can increase as well, thus reducing water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc.. The most appropriate water treatment must be determined locally, according to the type of system and local characteristics of the process water. The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by improperly treated water. D - KIMAC EN - 36/68

37 Table 2 - Acceptable water quality limits QUALITY OF REFRIGERATING WATER Recirculation Filling water water (20 C max) MAXIMUM VALUES Recirculation Filling water water (20 C max) MAXIMUM VALUES ph (25 C) Iron Electricity conductivity (ms/m) (25 C) (μs/cm) (25 C) 40 (400 ) 30 (300 ) Chloride ion (mgcl-/l) Sulphate ion (mgso22- /l) Alkalinity (ph4.8) Total hardness (mgcaco3/l) Total calcium (mgcaco3/l) Copper (mgcu/l) Sulphide ion (mgs2-/l) Ammonium ion (mgnh4+/l) Residual chlorine (mgcl/l) Free carbon dioxide (mgco2/l) not detectable not detectable Evaporator and exchangers antifreeze protection For correct antifreeze protection, all evaporators are fitted with thermostatically-controlled electrical antifreeze resistance. This provides suitable antifreeze protection down to temperatures of -25 C. The only alternative antifreeze protection consists of draining the heat exchangers completely and cleaning them with antifreeze solution. Two or more protection methods should be considered when designing the system as a whole: 1. Continuous water flow circulation inside piping and exchangers. 2. Addition of an appropriate amount of glycol inside the water circuit 3. Additional heat insulation and heating of exposed piping 4. Emptying and cleaning of the heat exchanger during the winter season. It is the responsibility of the installer and/or local maintenance personnel to ensure that two or more of the described antifreeze methods are used. Make sure that appropriate antifreeze protection is maintained at all times. Failure to follow the instructions above could result in damage to some of the machine's components. Damage caused by freezing is not covered by warranty. Correction coefficients for use of ethylenic glycol Ambient air temperature to C Recommended glycol percentage in weight Correction of refrigerating power Correction of power absorbed Flow correction Pressure drop correction Table 3 - Correction coefficients for use of ethylenic glycol D - KIMAC EN - 37/68

38 Minimum percentage of glycol for low water temperature Evaporator leaving water temperature C Ethylenic glycol (%) Propylene glycol (%) Minimum percentage of glycol for low ambient temperature Ambient air temperature C Ethylenic glycol (%) 10% 20% 30% 40% 50% Ambient air temperature C Propylene glycol (%) 10% 20% 30% 40% 50% Table 4 - Glycol percentages according to ambient temperature Installing the flow switch To ensure sufficient water flow through the evaporator, it is essential that a flow switch be installed on the water circuit. The purpose of the flow switch is to stop the machine in the event of interrupted water flow, thus protecting the evaporator from freezing. The flow switch can be installed either on the inlet or outlet water piping. A flow switch specifically gauged for this purpose is available as an optional accessory. This paddle-type flow switch is suitable for heavy-duty outdoor applications (IP67) and is supplied with a clean contact that must be electrically connected to terminals 8 and 23 of the terminal board M5 (check the machine's wiring diagram for further information). For further information regarding device installation, settings and choice, please read the instruction leaflet in the device box. Adjusting flow switch sensitivity Adjusting paddle length according to operating conditions Fig. 7 - Adjusting the safety flow switch Hydronic kit (optional) The optional hydronic kit prepared for this machine series can consist of a single line pump, or a two-line pump. Depending on the choice made during machine order, the kit may have the configuration shown in figure 7. To select the hydronic kit corresponding to the chosen machine, please refer to the catalogue. D - KIMAC EN - 38/68

39 Single pump hydronic kit Two pump hydronic kit 1. Victaulic connection 2. Water safety valve 3. Manifold connection 4. Antifreeze electrical resistance 5. Water pump (single or double) 6. Automatic filling unit N.B.: Arrangement of components and piping layouts may vary from that shown in the figure. Fig. 8 - Single and double pump (two pump) hydronic kit ATTENTION Install a suitable size expansion tank on the water circuit that is appropriate to the conditions of machine use. Refrigerating circuit safety valves Each system comes with safety valves that are installed on each circuit, both on the evaporator and on the condenser. The purpose of the valves is to release the refrigerant inside the refrigerant circuit in the event of operating malfunction or external fire. ATTENTION The unit is designed for outdoor use. In any case, check there is suitable air circulation around the machine. Should the machine be installed in closed, or semi-covered environments, prevent possible damage due to inhalation of refrigerant gas. Do not dispose of the refrigerant into the environment. Safety valves must be connected externally. The installer is responsible for sizing and connecting the safety valves to the venting pipes. D - KIMAC EN - 39/68

40 Electrical installation General specifications CAUTION All electrical connections to the machine must be carried out in compliance with laws and regulations in force. All installation, operating and maintenance activities must be carried out by qualified personnel. Please refer to the specific wiring diagram for the machine that you have purchased and which was sent with the unit. Should the wiring diagram not appear on the machine or should it have been lost, please contact your dealer who will provide for a copy to be forwarded. CAUTION Use copper conductors only. Failure to use copper conductors could cause overheating or corrosion at the connection points and damage the unit. To avoid interference, all control wires must be installed separately from the power wires. Use separate electrical conduits for this purpose. CAUTION Before servicing the machine in any way, open the general disconnecting switch on the machine's main power supply. When the machine is off but the disconnector switch is in the closed position, unused circuits are live as well. Never open the terminal board box of the compressors before having opened the unit's general disconnecting switch. CAUTION Series units are fitted with high power non-linear electrical components (VPD compressor supply). These cause superior harmonics and can cause significant leakage towards ground (about 2 A). The protection for the power supply system must be designed in accordance with the above-mentioned values. CAUTION The short circuit current that can be withstood by the electrical board in accordance with EN , is 25 ka. Please therefore check the short-circuit current at the machine power supply line connection terminals to ensure that it is less than or equal to the machine panel hold current. CAUTION In installations with power supply lines longer than 50 metres, inductive coupling between phases and between phase and earth generates significant phenomena, namely: unbalancing of phase currents excessive voltage drop In order to limit this phenomena, it is good practise to lay out the phase wires symmetrically, as described in the figure. Fig. 9 - Installation of long power supply wires D - KIMAC EN - 40/68

41 Electrical components All power and interface electrical connections are specified in the wiring diagram that is shipped with the machine. the installer must supply the following components: - Power supply wires (dedicated conduit) - Interconnection and interface wires (dedicated conduit) - thermal-magnetic circuit breaker of suitable size (please see electrical data). Electrical wiring Power circuit: Connect the electrical power supply cables to the terminals of the general circuit breaker on the machine's terminal board. The access panel must have a hole of appropriate diameter for the cable used and its cable gland. A flexible conduit can also be used, containing the three power phases plus earth. In any case, absolute protection against water penetrating through the connection point must be ensured. Control circuit: Every machine of the series is supplied with an auxiliary 400/115V control circuit transformer. No additional cable for the control system power supply is thus required. Only if the optional separate accumulation tank is requested, the electrical antifreeze resistance must have a separate power supply. Electrical heaters The machine has an antifreeze electrical heater installed directly on the evaporator. Each circuit also has an electrical heater installed in the compressor, whose purpose is to keep the oil warm thus preventing the presence of liquid refrigerant mixed with the oil in the compressor. Clearly, the operation of electrical heaters is guaranteed only if there is a constant power supply. If it is not possible to keep the machine powered when inactive during winter, apply at least two of the procedures described in the 'Mechanical installation' section under the 'antifreeze protection of evaporator and exchangers', and power the machine at least 24 hours prior to compressor start-up in order to allow the oil to warm up. Pump electrical supply On request, the machine can be fitted with a fully-wired pump kit controlled by the machine microprocessor. In this case, no further checks are required. Should the system use pumps outside the machine (not supplied with the unit), fit the supply line for each pump with a thermal-magnetic circuit breaker and a command contact. Water pump control Connect the control contactor coil power supply to terminals 27 and 28 (pump #1) and 48 and 49 (pump 2) located on terminal board M5, and install the contactor on a power supply with the same voltage as the pump contactor coil. The terminals are connected to a clean microprocessor contact. The microprocessor contact has the following commutation capacity: Maximum voltage: 250 V AC Maximum current: 2 A Resistive - 2 A Inductive Reference standard: EN The wiring described above allows the microprocessor to manage the water pump automatically. It is good practice to install a clean status contact pump's thermal-magnetic circuit breaker and to connect it in series with the flow switch. Alarm relays - Electrical wiring The unit has a clean-contact digital output that changes state whenever an alarm occurs in one of the refrigerant circuits. Connect this signal to an external visual or sound alarm, or to the BMS, in order to monitor its operation. See the machine's wiring diagram for wiring. on/off remote control - Electrical wiring The machine has a digital input that allows remote control. A start-up timer, a circuit breaker or a BMS can be connected to this input. Once the contact has been closed, the microprocessor launches the start-up sequence by first turning on the water pump and then the compressors. When the contact is opened, the microprocessor launches the machine shutdown sequence. The contact must be clean. Double setpoint - Electrical wiring The double setpoint function uses a switch to allow for to change over the unit setpoint between two predefined values in the unit controller. An example of an application is ice production during the night and standard operation during the day. Connect a circuit breaker or timer between terminals 20 and 21 and terminal board M5. The contact must be clean. D - KIMAC EN - 41/68

42 External water setpoint reset - Electrical wiring (optional) The machine's local setpoint can be modified by means of an external analogue 4-20 ma signal. Once this function has been enabled, the microprocessor allows for the modification of the setpoint from the set local value up to a differential of 3 C max. 4 [ma] corresponds to a 0 [ C] reset, 20 [ma] corresponds to the setpoint plus maximum differential. The signal cable must be directly connected to terminals 35 and 36 of the M5 terminal board. The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not to induce interference with the electronic controller. limitation - Electrical wiring (optional) The machine's microprocessor allows for the limitation of capacity by means of two separate criteria: Load limitation The load can be varied directly by means of 4-20 external signal or directly from a BMS. The signal cable must be directly connected to terminals 37 and 38 of the M5 terminal board. The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not to induce interference with the electronic controller. Current limitation (optional) This option, if installed, allows for the control of machine load according to current absorbed. Connect a switch, timer, clean BMS to terminals on the terminal board M5. Once the digital input is closed, the microprocessor will limit the current absorbed by the machine according to the command set point set. The enabling of this control needs enabling by means of a clean contact, using terminals 6-9 on terminal board M5. Caution: the two options cannot be enabled simultaneously. Setting one function excludes the other. Fig User connection tot he interface M3 terminal board General alarm Pump1 command Evaporator flowswitch Current limit enable External fault Double setpoint Setpoint override (4-20 ma) Common Demand limit (4-20 ma) Current limit (4-20 ma) Pump2 command On-off remote Comp1 alarm Comp2 alarm D - KIMAC EN - 42/68

43 Operation Operator's responsibilities It is important that the operator is appropriately trained and becomes familiar with the system before operating the machine. In addition to reading this manual, the operator must study the microprocessor operating manual and the wiring diagram in order to understand the start-up sequence, operation, shut-down sequence and operation of all safety devices. During the machine's initial start-up phase, an authorised technician is available to answer any questions and to give instructions as to the correct operating procedures. The operator is advised to keep a record of operating data for every installed machine. Another record should also be kept of all the periodical maintenance and servicing activities. If the operator notes abnormal or unusual operating conditions, he is advised to consult the authorised technical service. Description of the machine This machine, of the air-condensation type, is made up of the following main components: - Compressor: The single-screw compressor of the FR3B or FR4A series is of the semi-hermetic type and utilises gas from the evaporator to cool the motor and allow optimal operation under any expected load conditions. The oil-injection lubrication system does not require an oil pump as oil flow is ensured by the pressure difference between delivery and suction. In addition to ensuring lubrication of ball bearings, oil injection dynamically seals the screw, thus enabling the compression process. - Water exchanger: Direct expansion, shell and tube type for all models. - Air exchanger: Finned type with pipes, internally micro-finned, directly expanded onto the high-efficiency strip fin. - Fan: Axial, high-efficiency type. Allows for quiet system operation even during adjustment. - Expansion valve: As standard, the machine is fitted with an electronic expansion valve controlled by an electronic control device that optimises its operation. Description of the refrigeration cycle The low-temperature refrigerant gas from the evaporator is drawn by the compressor through the electric motor, cooling it. It is later compressed, and during this phase the refrigerant mixes with the oil from the separator. The high-pressure oil-refrigerant mix is drawn into the oil separator, that separates it. The oil accumulated on the bottom of the separator is forced by the pressure difference back into the compressor, while the oil-free refrigerant is sent to the condenser. The refrigerant liquid is evenly distributed inside the condenser throughout all bank circuits. As it passes through it cools and starts to condense. The condensed fluid at saturation temperature passes through the subcooling section where it loses even more heat, increasing cycle efficiency. Te heat taken from the fluid during cooling, condensation and subcooling is exchanged with that of the cooling air, which is discharged at higher temperatures. The subcooled fluid flows through the high-efficiency filter dryer and then reaches the lamination element through which a fall in pressure starts the evaporation process. The result at this point is a low-pressure and low-temperature liquid-gas mixture entering the evaporator. When the refrigerant liquid-vapour is uniformly distributed in the direct expansion evaporator tubes, heat is exchanged with the cooling water, thus reducing the temperature until complete evaporation, followed by superheating. Once it has reached the superheated-vapour state, the refrigerant leaves the evaporator and is once again taken into the compressor to repeat the cycle. D - KIMAC EN - 43/68

44 Fig refrigeration circuit 1. COMPRESSOR 2. 2-WAY DISCHARGE VALVE 3. HIGH-PRESSURE TRANSDUCER 4. SCHRADER VALVE 5. HIGH-PRESSURE SAFETY VALVE 6. FANS 7. CONDENSATION BANK 8. LOAD VALVE 9. 2-WAY ANGLE VALVE 10. FILTER DRYER 11. SIGHT GLASS 12. SOLENOID VALVE 13. THERMOSTATIC EXPANSION VALVE 14. NON-RETURN VALVE 15. ELECTRONIC EXPANSION VALVE 16. WATER OUTLET TEMP. TRANSDUCER 17. EVAPORATOR 18. WATER INLET TEMP. TRANSDUCER 19. LOW-PRESSURE SAFETY VALVE 20. SUCTION VALVE (OPTIONAL) 21. SUCTION GAS TEMP. TRANSDUCER 22. SUCTION GAS PRESS. TRANSDUCER 23. HIGH-PRESSURE PRESSURE SWITCH 24. OIL/DELIVERY PRESS. TRANSD. 25. DELIVERY GAS TEMP. TRANSDUCER 26. LIQUID INJECTION VALVE 27. LIQUID INJECTION MESH FILTER (*) Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connection of the partial recovery exchangers. D - KIMAC EN - 44/68

45 Description of the refrigeration cycle with partial heat recovery The low-temperature refrigerant gas from the evaporator is drawn by the compressor through the electric motor, cooling it. It is subsequently compressed and during this process, the refrigerant mixes with the oil from the oil separator. The high-pressure oil-refrigerant mix is drawn into the high-efficiency oil separator, that separates it. The oil depositing on the bottom of the separator through pressure difference is sent back to the compressor while the refrigerant that has been separate from the oil is sent to the partial recovery exchanger, where it dissipates the heat from post-overheating cooling, warming the water which travels through the exchanger. On leaving the exchanger, the refrigerant fluid enters the condensation bank where, by forced ventilation, it is condensed. The condensed fluid at saturation temperature passes through the subcooling section where it loses even more heat, increasing cycle efficiency. The subcooled fluid then passes through the high-efficiency filter dryer. It subsequently passes through the lamination element, which, by means of a pressure drop, starts the evaporation process. The result at this point is a low-pressure and low-temperature liquid-gas mixture entering the evaporator. When the refrigerant liquid-vapour is uniformly distributed in the direct expansion evaporator tubes, heat is exchanged with the cooling water, thus reducing the temperature, changing state until complete evaporation, followed by superheating. Once it has reached the superheated-vapour state, the refrigerant leaves the evaporator and is once again taken into the compressor to repeat the cycle. Controlling the partial recovery circuit and installation recommendations The partial heat recovery system is not managed and/or controlled by the machine. The installer should follow the suggestions below for best system performance and reliability: 1) Install a mechanical filter on the heat exchanger inlet pipe 2) Install shut-off valves to isolate the heat exchanger from the water system during periods of inactivity or system maintenance. 3) Install a drain valve that allows the heat exchanger to be emptied in the event that air temperature is expected to fall below 0 C during periods of machine inactivity. 4) Install flexible anti-vibration joints on the heat recovery water inlet and outlet piping, so that transmission of vibrations, and therefore noise, to the water system is kept as low as possible. 5) Do not load exchanger joints with the weight of the heat recovery piping. The water joints of the exchangers are not designed to support the weight. 6) Should heat recovery water temperature be lower than ambient temperature, it is advised to switch off the heat recovery water pump 3 minutes after having switched off the last compressor. IMPORTANT Partial heat recovery, which exploits the post-overheating cooling of the delivery gas, is designed as a source to integrate an external heating source. Recovery availability is only guaranteed with the refrigerating circuit operating upon request of the refrigerated water circuit. Specifically, it is not suitable for operation with exchanger water inlet temperatures of below 40 C for periods in excess of normal system operation (approx. 30 minutes). Prolonged operation in these conditions can lead to malfunctions of the refrigerating circuit and the intervention of the protective devices. The installer must ensure that the recovery circuit water reaches the minimum value admitted as quickly as possible. This is also why the lack of water flow must be ensured in the exchanger when the refrigerating circuit is not running. D - KIMAC EN - 45/68

46 Fig Refrigeration circuit unit with partial heat recovery M M M M M M 8. COMPRESSOR 9. 2-WAY DISCHARGE VALVE 10. HIGH-PRESSURE TRANSDUCER 11. SCHRADER VALVE 12. HIGH-PRESSURE SAFETY VALVE 13. FANS 14. CONDENSATION BANK 15. LOAD VALVE WAY ANGLE VALVE 17. FILTER DRYER 18. SIGHT GLASS 19. SOLENOID VALVE 20. THERMOSTATIC EXPANSION VALVE 21. NON-RETURN VALVE 22. ELECTRONIC EXPANSION VALVE 23. WATER OUTLET TEMP. TRANSDUCER 24. EVAPORATOR 25. WATER INLET TEMP. TRANSDUCER 26. LOW-PRESSURE SAFETY VALVE 27. SUCTION VALVE (OPTIONAL) 28. SUCTION GAS TEMP. TRANSDUCER 28. SUCTION GAS PRESS. TRANSDUCER 29. HIGH-PRESSURE PRESSURE SWITCH 30. OIL/DELIVERY PRESS. TRANSD. 31. DELIVERY GAS TEMP. TRANSDUCER 32. LIQUID INJECTION VALVE 33. LIQUID INJECTION MESH FILTER (*) Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connection of the partial recovery exchangers. Compressor The single-screw compressor is of the semi-hermetic type with an asynchronous three-phase, two-pole motor directly splined on the main shaft. The suction gas from the evaporator cools the electric motor before entering the suction ports. There are temperature sensors inside the electric motor which are completely covered by the coil winding and constantly D - KIMAC EN - 46/68

47 monitor motor temperature. Should the coil winding temperature become very high (120 C), a special external device connected to the sensors and to the electronic controller will deactivate the corresponding compressor. There are only three moving rotating parts and there are no other parts in the compressor with an eccentric and/or alternating movement. The basic components are therefore only the main rotor and the two satellites that carry out the compression process, meshing perfectly together. The F3B and F4A compressors are fitted with two satellites arranged horizontally to the screw. Compression sealing is obtained thanks to a suitably-shaped special composite material that is interposed between the main screw and the satellite. The main shaft on which the main rotor is splined is supported by ball bearings. The system made up in this way is both statically and dynamically balanced before assembly. Fig Picture of F4AL compressor Compression process with the single-screw compressor, the suction, compression and discharge process takes place in a continuous manner thanks to the two satellites. In this process, the suction gas penetrates into the profile between the rotor, teeth of the upper satellite and the compressor body. The volume is gradually reduced by compression of the refrigerant. The compressed gas under high pressure is thus discharged into the built-in oil separator. In the oil separator, the gas/oil mixture separates and the oil is collected in a cavity in the lower part of the compressor, where it is injected into the compressor mechanisms in order to guarantee compression sealing and lubrication of the ball bearings. STAGE 1: Initial suction STAGE 2: Suction end STAGE 3: Compression STAGE 4: Discharge start STAGE 5: Discharge end Fig Compression process D - KIMAC EN - 47/68

48 STAGE 1-2 SUCTION During screw rotation, the main rotor flutes communicate with the suction chamber, where they begin suction without compressing the gas mixture. As it rotates, the main rotor increases the effective length of the free flute, thereby increasing the volume open to the suction. This fills the flute up to its closing towards the suction chamber by means of the satellite teeth, which gears onto the screw. Once the gas is closed into the flute and the suction chamber is separated, the suction stage is complete. STAGE 3 COMPRESSION As the main rotor turns, the volume of gas trapped within the screw flute is reduced by the satellite teeth that gear onto the screw, thereby reducing the volume available to the gas mixture. This entails compression mixture to its maximum value. STAGE 4-5 DISCHARGE As the satellite tooth approaches the end of the flute, the pressure of the trapped vapour reaches a maximum value occurring near the triangular aperture of the discharge port. Compression immediately ceases and the gas is delivered into the discharge manifold. The satellite tooth continues to push the vapour until the flute volume reaches a minimum value. This compression process is repeated for each screw flute at each turn. Refrigeration capacity control The compressors are set up as standard with an infinite control of their capacity. Two shutters reduce reduce suction capacity, delaying flute closing and decreasing its effective length. These shutters are used to allow the compressor to operate at minimum and maximum loads. The shutters are controlled by the pressure of the oil from the separator or drained towards compressor suction. A spring helps create the force necessary to move the shutter. The compressors for the EWAD-C- series use two shutters for both load and discharge, controlled by the oil-gas flow through the circuits and directly controlled by the controller through the solenoid valves that are normally closed (NC). The first shutter allows you to change both the load and discharge continuously. The second, on the other hand, has the on/off operation. Both individually guarantee a 50% change in load/discharge. Modulating box The operating diagram of the modulating box is shown in the following figure. The system is controlled by three solenoids, A, B, C, which are normally closed if not powered, and by a spring assembled directly onto the slide. During loading, solenoid C is closed because it is not excited, whilst the remaining A and B are energised. With this configuration, the gas from the supply pressure runs through to the chamber on the right of the slide where the pressure wins over the spring resistance, whilst the pipe, passing by the open solenoid B, allows the oil to drain towards suction. In the drain phase, on the other hand, solenoids A and B are de-excited and therefore closed, whilst solenoid C is opened. In this way, the oil flow, to the delivery pressure, runs towards the chamber to the left of the slide, moving it towards the left helped by the spring action. At the same time, the gasses contained on the right-hand side of the slide discharge in suction, through the free vent pipes. Non-modulating on/off box The non-modulating slide operating diagram is shown in the following figure. The slide is only controlled by means of the opening and closing of two solenoids that always operate by opposition. During the load stage, the solenoid bringing the the slide chamber into communication with the suction is opened, thereby helping pressurised oil drain towards the suction, moving the slide to the load position up to maximum extension. On the contrary, if closed at the same time as the second slide opens, it allows the pressurised oil flowing from the delivery to move the slide to the discharge position until maximum extension. D - KIMAC EN - 48/68

49 MODULATING BOX OIL SUPPLY FROM DELIVERY DRAINAGE TOWARDS SUCTION GAS SUPPLY FROM DELIVERY LOAD DIRECTION LOAD DISCHARGE A B C ON ON OFF OFF OFF ON NON-MODULATING BOX DRAINAGE IN SUCTION TO BE ENERGISED TO LOAD THE BOX LOAD DIRECTION OIL SUPPLY FROM DELIVERY TO BE ENERGISED TO DISCHARGE SUPPLY OF OIL Fig Operating layout of load/discharge boxes D - KIMAC EN - 49/68

50 Pre-startup checks General Once the machine has been installed, use the following procedure to check that it has been done correctly: CAUTION Switch off the power supply of the machine before performing any checks. As there are condensers inside the VFDs, voltage is supplied at their output for a few minutes after power has been disconnected. Wait for the VFD LEDs to go out before working on the unit. If in doubt, refer to the VFD instruction manuals. Failure to comply with these rules (failure to open the power switches and failure to wait) can result in serious injury to the operator, or even death. Inspect all the electrical connections to the power circuits and to the compressors, including the contactors, fuse carriers and electrical terminals and check that they are clean and well-secured. Even though these checks are carried out at the factory on every machine that is shipped, vibrations during transport may loosen some electrical connections. CAUTION Check that the electrical terminals are well-tightened. A loose cable can overheat and give rise to problems with the compressors. Open the discharge, liquid, liquid injection and suction (if installed) valves. WARNING Do not start-up the compressors if the discharge, liquid, liquid injection and suction valves are closed. Failure to open these valves can cause serious damage to the compressor. Set all fan thermal-magnetic circuit breakers to on (from Q101 to Q110 and from Q201 to Q210). IMPORTANT If the fan thermal-magnetic circuit breakers are left on, at first start-up, both compressors will high-pressure block. To reset the high pressure alarm, you will need to open the compressor room and reset the high pressure mechanical pressure switch. Check the power supply voltage at the general door-block disconnector switch terminals. The power supply voltage must be the same as that on the nameplate. Maximum tolerance allowed ± 10%. Voltage unbalance between the three phases must not exceed ± 3%. The unit comes with a factory-supplied phase monitor that prevents compressors from starting if the phase sequence is incorrect. Properly connect the electrical terminals to the disconnector switch so as to ensure alarm-free operation. If the phase monitor triggers an alarm once the machine has been powered, just invert two phases at the general disconnecting switch supply (unit power supply). Never invert the electrical wiring on the monitor. ATTENTION Starting-up with the incorrect phase sequence irreparably compromises operation of some components. Ensure that phases L1, L2 and L3 correspond in sequence to R, S and T. Fill the water circuit and remove air from the system's highest point and open the air valve above the evaporator shell. Remember to close it again after filling. The design pressure on the water side of the evaporator is 10.5 bar. Never exceed this pressure at any time during the life of the machine. D - KIMAC EN - 50/68

51 IMPORTANT Before putting the machine into operation, clean the water circuit. Dirt, scaling, corrosion residue and other foreign material can accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drops can increase as well, thus reducing water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc.. The most appropriate water treatment must be determined locally, according to the type of system and local characteristics of the process water. The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by improperly treated water. s with external water pump Start the water pump and check the water system for any leaks. Repair if necessary. While the water pump is in operation, adjust the water flow until the design pressure drop for the evaporator is reached. Adjust the flow switch trigger point (not factory-supplied) to ensure operation of the machine within a ± 20% flow range. s with built-in water pump This procedure entails the factory installation of the optional single or two water pump kit. Check that switches Q0, Q1 and Q2 are in the open position (Off or 0). Also check that the thermal-magnetic circuit breaker Q12 inside the electrical board control area, is in the off position. Close the general door-block disconnector switch Q10 on the main electrical board hatch and move switch Q12 to the on position. ITEM DESCRIPTION ITEM DESCRIPTION Q0 UNIT ON/OFF Q10 MAIN SWITCH Q1 SWITCH CIRCUIT 1 Q11 EMERGENCY BUTTON Q2 SWITCH CIRCUIT 2 Q12 SWITCH THERMAL-MAGNETIC Q3 SWITCH CIRCUIT 3 Table 5 - Nomenclature of switches CAUTION From this moment on, the machine will be electrically powered. Take great care over the following operations. Failure to pay attention during the subsequent activities may lead to serious personal injury. Single pump To start-up the water pump, press the microprocessor on/off button and wait for the display to show the message 'unit on'. Rotate the switch Q0 to the on position (or 1) to start up the water pump. Adjust water flow until reaching the evaporator design pressure drop. Now adjust the flow switch (not factory-supplied) to ensure operation of the machine within a ± 20% flow range. Double pump The system provides for the use of a double pump with two motors, one as the other's reserve. The microprocessor enables one of the two pumps according to the fewest number of hours and start-ups. To start-up one of the two water pumps, press the microprocessor on/off button and wait for the display to show the message 'unit on'. Rotate the switch Q0 to the on position (or 1) to start it up. Adjust water flow until reaching the evaporator design pressure drop. Now adjust the flow switch (not factory-supplied) to ensure operation of the machine within a ± 20% flow range. To start-up the pump, open switch QP2. Use the microprocessor keypad to establish pump start-up priority. See the microprocessor manual for the relative procedure. Use the microprocessor keypad to establish pump start-up priority. See the microprocessor manual for the relative procedure. Electrical supply Machine voltage supply must be the same as that specified on the nameplate ± 10%. Voltage unbalancing between phases must not exceed ± 3%. Measure voltage between the phases. If the value reported does not fall within the established limits, correct before starting up the machine. D - KIMAC EN - 51/68

52 ATTENTION Supply appropriate voltage. Unsuitable voltage may cause the control components to malfunction and undesired intervention by the thermal protective devices as well as a substantial reduction in the life of the contactors and electrical motors. Unbalancing of the voltage supply In a three-phase system, excessive unbalancing of phases is the cause of motor overheating. The maximum voltage unbalance permitted is 3%, calculated as follows: V V MAX AVG Unbalancing %: x100 = % VAVG AVG = average Example: the three phases respectively measure 383, 386 and 392 volts, the average is: = 387 Volt 3 the unbalancing percentage is therefore x 100 = 1,29% less than the maximum permitted (3%). 387 Electrical heaters power supply Each compressor comes with an electrical heater located at the bottom of compressor. Its purpose is to warm up the lubricating oil and thus avoid the mixing of refrigerant fluid within. It is therefore necessary to ensure that the heaters are powered at least 24 hours before the planned start-up time. To ensure that they are activated, it is sufficient to keep the machine on by closing the general disconnecting switch Q10. The microprocessor, however, has a series of sensors that prevent the compressor from being started up when the oil temperature is not at least 5 C above the saturation temperature corresponding to the suction pressure. Keep the Q0, Q1, Q2 and Q12 switches in the off (or 0) position, until the machine is to be started-up. D - KIMAC EN - 52/68

53 Start-up procedure Turning on the machine 1. With the general disconnecting switch Q10 closed, check that switches Q0, Q1, Q2,Q3 and Q12 are in the off (or 0) position. 2. Close the thermal-magnetic switch Q12 and wait for the microprocessor and control to start. Check that the oil temperature is warm enough. The oil temperature must be at least 5 C above the saturation temperature of the refrigerant in the compressor. If the oil is not warm enough, it will not be possible to start the compressors and the phrase 'Oil Heating' will appear on the microprocessor display. 3. Start the water pump, if the machine is not fitted with its own. 4. Turn the Q0 switch to on and wait for '-on/compressor stand-by to appear on the display. If the water pump is supplied with the machine, the microprocessor should now start-up. 5. Check that the evaporator pressure drop is the same as the design pressure drop and correct if necessary. The pressure drop must be measured at the factory-supplied charge connections placed on the evaporator piping. Do not measure the pressure drops at points where any valves and/or filters are interposed. 6. When starting-up for the first time, turn the Q0 switch to off to check that the water pump stays on for three minutes before it stops (both the pump on-board the machine and any external pump). 7. Turn the Q0 switch to on again. 8. Check that the local temperature setpoint is set to the required value by pressing the set key. 9. Turn the Q1 switch to on (1) to start compressor #1 or complete the start-up procedure controlled by the processor, by enabling Q1, Q2 and Q Once the compressor has started, wait for at least 1 minute for the system to stabilise. During this type the controller will perform a series of operations to empty the evaporator (pre-purge) to ensure a safe start-up. 11. At the end of the pre-purge, the microprocessor will start loading the compressor, now running, in order to reduce the outlet water temperature. Check correct functioning of the capacity control by measuring the compressor's electrical current consumption. 12. Check refrigerant evaporation and condensation pressure. 13. Check cooling fan start-up according to the lowering of the condensation pressure. 14. Once the refrigeration circuit has stabilised, check that the liquid sight glass located on the expansion valve inlet pipe is completely full (without bubbles) and that the humidity indicator shows 'dry'. Any bubbles inside the liquid sight glass may indicate a low refrigerant level or an excessive pressure drop through the filter dryer or an expansion valve that is blocked at the full open position. 15. In addition to checking the liquid sight glass, check circuit operating parameters by verifying: a) Superheating of compressor suction b) Superheating of compressor discharge c) Subcooling of liquid coming out of the condenser banks d) Evaporation pressure e) Condensation pressure All other measurements can be carried out by reading the relevant values directly on the on-board microprocessor display. 16. Turn the Q2 switch to on (1) to start-up compressor # Repeat steps 10 to 15 for the second circuit. 18. To turn off the machine temporarily (daily or weekend shut-down), turn the Q0 switch to off (0) or open the remote contact between terminals 58 and 59 of terminal board M5 (installation of a remote switch to be carried out by the customer). the microprocessor will active the shut-down procedure, which will take a few seconds. Three minutes after the compressors have been shut down, the microprocessor will shut down the pump. Do not switch off the main power supply so as not to de-activate the electrical resistances of the compressors and the evaporator. Table 6 - Typical operating conditions with compressors at 100% Economised cycle? Suction superheating Delivery Liquid subcooling superheating NO 5 7 C C 5 6 C YES 5 7 C C C IMPORTANT The symptoms of low refrigerant charge are: low evaporation pressure high suction and discharge superheating (beyond the above limits) and low subcooling level. Before adding refrigerant, check the cause of the leak. After repair, add refrigerant R134a to the relevant circuit. The system has been provided with a charge connection between the expansion valve and the evaporator. Charge refrigerant until working conditions return to normal. Remember to reposition the valve cover when finished. D - KIMAC EN - 53/68

54 IMPORTANT If the machine is not supplied with a built-in pump, do not shut down the external pump before 3 minutes have elapsed after the last compressor shut-down. Early shut-down of the pump triggers a water-flow failure alarm. Seasonal shut-down 1. Turn switches Q1, Q2 and Q3 to off (or 0) to shut down the compressors, using the normal pump-down procedure. 2. After the compressors have been shut down, turn switch Q0 to off (or 0) and wait for the built-in water pump to shut down. If the pump is managed externally, wait 3 minutes after the compressors have shut down before turning off the pump. 3. Open the Q12 thermal-magnetic switch (off position) inside the control section of the electrical board and then open the general disconnecting switch Q10 to cut off the machine's power supply entirely. 4. Close the compressor intake valves (if any) and delivery valves, as well as the valves located on the liquid and liquid injection line. 5. Place a warning sign on every switch that has been opened, advising to open all valves before starting compressors. 6. If no water and glycol mixture has been introduced into the system, discharge all water from the evaporator and from the connected piping if the machine is to remain inactive during the winter season. Remember that once the machine's power supply has been cut off, the antifreeze electrical resistance cannot function. Do not leave the evaporator and piping exposed to the atmosphere. Start-up after seasonal shut-down 1. With the general disconnecting switch open, make sure that all electrical connections, cables, terminals and screws are well tightened to ensure good electrical contact. 2. Check that the power supply voltage applied to the machine is within ± 10% of nominal nameplate voltage and that the voltage unbalance between the phases is within the ± 3% range. 3. Check that all control devices are in good condition and functioning and that there is a suitable thermal load for start-up. 4. Check that all connection valves are well tightened and that there are no refrigerant leaks. Always reposition the valve covers. 5. Check that switches Q0, Q1, Q2, Q3 and Q12 are in the open position (Off). Turn the general disconnecting switch Q10 to the on position. Doing this will allow you to turn on the compressor electrical resistances. Wait at least 24 hours for their start-up. 6. Open all suction, delivery, liquid and liquid injection valves. Always reposition the valve covers. 7. Open the water valves to fill the system and vent the air from the evaporator through the vent valve installed on its shell. Check that there are no water leaks from the piping. D - KIMAC EN - 54/68

55 System maintenance WARNING All routine and non-routine maintenance activities on the machine must be carried out solely by qualified personnel who have been suitably trained and are familiar with the device, its operation and maintenance, and who are aware of the safety requirements and risks involved. WARNING It 's absolutely forbidden to remove all the protections of the moving parts of the unit ATTENTION The causes of repeated shut-downs deriving from triggering of safety devices must be investigated and corrected. Simply re-starting the alarms may seriously damage the equipment. ATTENTION A correct refrigerant and oil change is essential for optimal operation of the machine and for environmental protection. Any oil and refrigerant recovery must conform to legislation in force. General IMPORTANT Besides the checks suggested hereto, in order to keep the unit at optimal performance levels and efficiency and prevent malfunction, it is recommended to schedule periodical inspections of the unit by qualified personnel. Specifically, the following is recommended: 4 inspections per year (every three months) for units running about 365 days per year 2 inspections per year (1 at seasonal start-up and the second mid-season) for units running about 180 days per year 1 inspection per year (at seasonal start-up) for units running about 90 days per year Regular checks and routine controls should be considered extremely important both during initial start-up and regularly during operation. These checks also include suction and condensation pressures, the sight glass on the liquid line and that the superheating and subcooling parameters, read through the microprocessor installed on the machine, fall within the range of operating parameters. A recommended ordinary maintenance programme is given at the end of this chapter, whilst an operating data collection card is at the end of the manual. We recommend recording all machine operating parameters on a weekly basis. The collection of this data will also be very useful for technicians, should technical assistance be required. Compressor maintenance IMPORTANT Although the single-screw compressor is of a semi-hermetic type and therefore does not need scheduled maintenance, for the purposes of keeping the compressor at optimal levels of performance and efficiency and to prevent malfunction, we recommend a visual check on the sate of satellite wear every 10,000 hours of operation, and a measurement of satellite-screw coupling tolerance. This inspection must be carried out by qualified, trained personnel. Vibration analysis is a good method for verifying the mechanical conditions of the compressor. Verification of vibration readings immediately after start-up and periodically on an annual basis is recommended. The compressor load must be similar to the previous measurement's load to ensure measurement reliability. D - KIMAC EN - 55/68

56 Lubrication The units do not require a routine procedure for lubrication of components. The fan bearings are permanently lubricated and as such no additional lubrication is required. Compressor oil is synthetic and highly hygroscopic. It is therefore advised to limit its exposure to the atmosphere during storage and filling. It is recommended that oil is exposed to the atmosphere for a period of no more than 15 minutes. The compressor oil filter is positioned above the oil separator (delivery side). Replacement is recommended when its pressure drop exceeds 2.0 bar. The pressure drop across the oil filter is the difference between the compressor discharge pressure and oil pressure. Both these pressures can be monitored through the microprocessor for both compressors. SOLENOID LOAD VALVE SOLENOID DISC HIGH-PRESSURE PRESSURE SWITCH HIGH-PRESSURE TRANSDUCER OIL FILTER OIL AND DELIVERY TEMPERATURE TRANSDUCER OIL LOAD/DISCHARGE VALVE POSITION MAXIMUM OIL LEVEL MINIMUM OIL LEVEL POSITION OF ELECTRIC RESISTANCE FOR OIL HEATING Fig Installation of F4AL compressor control devices D - KIMAC EN - 56/68

57 Ordinary maintenance Table 7 - Ordinary maintenance schedule List of activities Weekly Monthly (Note 1) General: Collection of operating data (Note 3) X Visual inspection of machine for any damage and/or loosening X Checking of thermal insulation integrity Clean and paint where necessary Water analysis (6) Yearly (Note 2) X X X Electrical: Checking of correct function of on-board machine instruments Check contactor wear - Replace if necessary Check fastening of all electrical terminals - Tighten if necessary Clean the inside of the electrical control board Visual inspection of components for any signs of overheating Check operation of compressor and electrical resistance Measure compressor motor insulation using the Megger X X X X X X X Refrigeration circuit: Check for any refrigerant leakage Check refrigerant flow using the liquid sight glass - Sight glass full Check filter dryer pressure drop Check oil filter pressure drop (Note 5) Analyse compressor vibrations Analyse compressor oil acidity (7) X X X X X X Condenser section: Clean the condensation banks (Note 4) Check that the fans are properly fastened Check the bank fins - Comb if necessary X X X N.B.: 1) Monthly activities include all weekly ones 2) Yearly (or early season) activities include all weekly and monthly activities 3) Machine operating values should be read on a daily basis thus keeping high observation standards. 4) Bank cleaning may be necessary more frequently in environments with a high percentage of particles in the air. 5) Replace the oil filter when the pressure drop reaches 2.0 bar 6) Check for any dissolved metals 7) TAN (Total Acid Number) : 0.10 : No action Between 0.10 and 0.19 : Replace anti-acid filters and check after 1,000 running hours. Continue to replace filters until the TAN is lower than >0.19 : Change oil, replace oil filter and filter dryer. Check at regular intervals. Filter dryer replacement It is strongly recommended that the filter dryer cartridges be replaced in the event of a considerable pressure drop across the filter, or if bubbles are observed through the liquid sight glass while the subcooling value is within the accepted limits. Replacement of the cartridges is advised when the pressure drop across the filter reaches 50 kpa with the compressor under full load. The cartridges must also be replaced when the humidity indicator in the liquid sight glass changes colour and shows excessive humidity, or when the periodic oil test reveals the presence of acidity (TAN is too high). Filter dryer cartridge replacement procedure ATTENTION Ensure proper water flow through the evaporator during the entire servicing period. Interrupting the water flow during this procedure would cause the evaporator to freeze, with consequent breakage of internal piping. 1. Shut down the relevant compressor turning the Q1 or Q2 switch to off. 2. Wait until the compressor has stopped and close the valve located on the liquid line. D - KIMAC EN - 57/68

58 3. Start up the relevant compressor turning the Q1 or Q2 switch to on. 4. Check the microprocessor display for the corresponding evaporation pressure. 5. When evaporation pressure reaches 100 kpa, turn switch Q1 or Q2 once again, to shut the compressor down. 6. Once the compressor has stopped, place a label on the start-up switch of the compressor being serviced, to avoid undesired start-ups. 7. Close the compressor suction valve (if any). 8. Using a recovery unit, remove surplus refrigerant from the liquid filter until atmospheric pressure is reached. The refrigerant must be stored in a suitable and clean container. WARNING To protect the environment, do not release removed refrigerant into the atmosphere.x Always use a recovery and storage device. 9. Balance internal pressure with external pressure by pressing the vacuum pump valve installed on the filter cover. 10. Remove the filter dryer cover. 11. Remove the filter elements. 12. Install the new filter elements in the filter. 13. Replace the cover gasket. Do not allow any mineral oil onto the filter gasket so as not to contaminate the circuit. Use only compatible oil for this purpose (POE) 14. Close the filter cover. 15. Connect the vacuum pump to the filter and pull vacuum to 230 Pa. 16. Close the vacuum pump valve. 17. Recharge the filter with the refrigerant recovered during emptying. 18. Open the liquid line valve. 19. Open the suction valve (if any). 20. Start up the compressor turning the Q1 or Q2 switch. Oil filter replacement IMPORTANT The lubrication system has been designed to keep most of the oil charge inside the compressor. During operation, however, a small amount of oil circulates freely in the system, conveyed by the refrigerant. The amount of replacement oil going into the compressor should therefore be equal to the quantity removed rather than the amount stated on the nameplate. This will avoid excess oil during the following start-up. The quantity of oil removed from the compressor must be measured after having allowed the refrigerant present in the oil to evaporate for a suitable amount of time. To reduce the refrigerant content in the oil to a minimum, it is advised that the electrical resistances be kept on and that the oil be removed only when it has reached a temperature of C. ATTENTION The replacement of the oil filter requires careful attention with regard to the oil recovery. The oil must not be exposed to air for more than about 30 minutes. In case of doubts, check oil acidity or, if it is impossible to carry out the measurement, replace the charge of lubricant with fresh oil stored in sealed tanks or as specified by the supplier. The compressor oil filter is positioned beneath the oil separator (delivery side). Replacement is recommended when its pressure drop exceeds 2.0 bar. The controller stops the compressor in an alarm status when the filter pressure drop reaches 2.5 bar. The pressure drop across the oil filter is the difference between the compressor delivery pressure minus oil pressure. Both these pressures can be monitored through the microprocessor for both compressors. Compatible oils: Daphne PVE Hermetic oil FCV 68D Oil filter replacement procedure 1) Shut down both compressors by turning the Q1 and Q2 switches to the off position. 2) Turn the Q0 switch to off, wait for the circulation pump to turn off and open the general disconnecting switch Q10 to cut off the machine's electrical power supply. 3) Place a label on the handle of the general disconnecting switch in order to prevent accidental start-up. 4) Close the suction, discharge and liquid injection valves. 5) Connect the recovery unit to the compressor and recover the refrigerant in a suitable and clean container. D - KIMAC EN - 58/68

59 6) Evacuate the refrigerant until the internal pressure has turned negative (compared to atmospheric pressure). The amount of refrigerant dissolved in the oil is therefore reduced. 7) Drain the oil in the compressor by opening the drain valve located under the oil separator. 8) Remove the oil filter cover and the internal filter element. 9) Replace the cover o-ring and internal sleeve. Do not lubricate the o-ring with mineral oil in order not to contaminate the system. 10) Insert the new filter element. 11) Reposition the filter cover and tighten the screws. The screws must be tightened alternately and progressively, setting the torque wrench at 60 Nm. 12) Charge the oil from the upper cover on the oil separator. Considering the high hygroscopy of ester oil, it should be charged as quickly as possible. Do not expose ester oil to the atmosphere for more than 15 minutes. 13) Close the oil charging cover. 14) Connect the vacuum pump and evacuate the compressor up to a vacuum of 230 Pa. 15) On reaching the above vacuum level, close the vacuum pump valve. 16) Open the suction, discharge and liquid injection system valves. 17) Disconnect the vacuum pump from the compressor. 18) Remove the warning label from the general disconnecting switch. 19) Close the general disconnecting switch Q10 to supply power to the machine. 20) Start the machine by following the start-up procedure described above. Refrigerant charge IMPORTANT The units have been designed to operate with R134a refrigerant. DO NOT USE refrigerants other than R134a. WARNING The addition or removal of refrigerant gas must be in accordance with current regulations and laws. ATTENTION When refrigerant gas is added to or removed from the system, ensure proper water flow through the evaporator for the entire charge/discharge time. Interrupting the water flow during this procedure would cause the evaporator to freeze, with consequent breakage of internal piping. Damage caused by freezing makes the warranty void. WARNING Removal of the refrigerant and replenishing operations must be performed by technicians who are qualified to use the appropriate materials for this unit. Unsuitable maintenance can result in uncontrolled losses in pressure and fluid. Do not disperse the refrigerant and lubricating oil in the environment. Always be equipped with a suitable recovery system. The units ship with a full refrigerant charge, but in some cases it may be necessary to replenish the machine in the field. WARNING Always check the causes of a loss of refrigerant. Repair the system if necessary, then recharge it. The machine can be replenished under any stable load condition (preferably between 70 and 100%) and under any ambient temperature condition (preferably above 20 C). The machine should be kept running for at least 5 minutes to allow the fan steps to stabilise and therefore condensation pressure. The units have approximately 15% of condensation banks devoted to subcooling of the refrigerant liquid. The subcooling value is equal to approx. 5-6 C (10-15 C for the economised machines). Once the subcooling section has been completely filled, additional refrigerant will not increase system efficiency. However, a small additional quantity of refrigerant (1 2 kg) makes the system less sensitive. N.B.: As the load changes and the number of active fans changes, subcooling also changes and takes a few minutes to stabilise. In any case, it must never go below 3 C in any condition. Furthermore, the subcooling value may change slightly as the water temperature and suction superheating vary. One of the two following scenarios can arise in a machine without refrigerant: D - KIMAC EN - 59/68

60 1. If the refrigerant level is slightly low, the flow of bubbles can be seen through the liquid sight glass. Replenish the circuit as described in the replenishment procedure. 2. If the gas level in the machine is moderately low, the corresponding circuit could have some low pressure stops. Replenish the corresponding circuit as described in the replenishment procedure. Refrigerant replenishment procedure 1) If the machine has lost refrigerant, it is necessary to first establish the causes before carrying out any replenishment operation. the leak must be found and repaired. Oil stains are a good indicator, as they can appear in the vicinity of a leak. However, this is not necessarily always a good search criterion. Searching with soap and water can be a good method for medium to large leaks, while an electronic leak detector is required to find small leaks. 2) Add refrigerant to the system through the service valve on the evaporator inlet pipe. 3) The refrigerant can be added under any load condition between 25 and 100% of the circuit. Suction superheating must be between 4 and 6 C. 4) Add enough refrigerant to fill the liquid sight glass entirely so that no flow of bubbles can be seen any more. Add an extra 2 3 kg of refrigerant as a reserve, to fill the subcooler if the compressor is operating at % load. 5) Check the subcooling value by reading the liquid pressure and the liquid temperature near the expansion valve. The subcooling valve must be between 4 and 8 C and 10 and 15 C for the machines with economiser. The subcooling value will be lower at % load and greater at 50% load. 6) With ambient temperature higher than 16 C, all fans must be on. 7) Overcharging the system will cause a rise in the compressor's discharge pressure, due to excessive filling of the condensation section tubes. Table 8 - Pressure/Temperature Pressure/Temperature table of the HFC-134a C Bar C Bar C Bar C Bar D - KIMAC EN - 60/68

61 Standard checks Temperature and pressure sensors The unit comes factory-equipped with all the sensors listed below. Periodically check that their measurements are correct by means of reference instruments (manometers, thermometers) and correct any wrong readings as necessary, using the microprocessor keypad. Well-calibrated sensors guarantee greater machine efficiency and a longer life. N.B.: refer to the microprocessor use and maintenance manual for a complete description of the applications, settings and adjustments. All sensors are preassembled and connected to the microprocessor. The descriptions of each sensor are listed below: Outlet water temperature sensor This sensor is located on the evaporator outlet water connection and is used by the microprocessor to control the machine load depending on the system's thermal load. It also helps control the evaporator's antifreeze protection. Inlet water temperature sensor This sensor is located on the evaporator inlet water connection and is used for monitoring the return water temperature. External air temperature sensor Optional. This sensor allows for the monitoring of the external air temperature on the microprocessor display. It is also used to carry out the 'OAT setpoint override'. Compressor discharge pressure compressor - This is installed on every compressor and allows to monitor the discharge pressure and to control the fans. Should the condensation pressure increase, the microprocessor will control the compressor load in order to allow it to function even if split. It also contributes to the oil control logic. Oil pressure transducer - This is installed on every compressor and allows you to monitor the oil pressure. The microprocessor uses this sensor to inform the operator on the conditions of the oil filter and on how the lubrication system is functioning. By working together with the high and low pressure transducers, it protects the compressor from problems deriving from poor lubrication. Low pressure compressor - This is installed on every compressor and allows to monitor the compressor suction pressure along with the low pressure alarms. It also contributes to the oil control logic. Suction sensor This is installed optionally (if the electronic expansion valve has been requested) on every compressor, and allows for the monitoring of suction temperature. The microprocessor uses the signal from this sensor to control the electronic expansion valve. Compressor discharge temperature sensor - This is installed on every compressor and allows to monitor the compressor discharge pressure along with the oil temperature. The microprocessor uses the signal from this sensor to control liquid injection and shut down the compressor should discharge temperature reach 110 C. It also protects the compressor from pumping liquid at start-up. D - KIMAC EN - 61/68

62 Test sheet It is recommended that the following operation data are recorded periodically to check correct operation of the machine over time. This data will also be extremely useful to the technicians who will be performing routine and/or non-routine maintenance on the machine. Water side measurements Chilled water setpoints C Evaporator outlet water temperature C Evaporator inlet water temperature C Evaporator pressure drop kpa Evaporator water flow rate m 3 /h Refrigerant side measurements Circuit #1: Compressor load % No. fans enabled No. expansion valve steps (electronic only) Refrigerant/oil pressure Evaporation pressure Bar Condensation pressure Bar Oil pressure Bar Refrigerant temperature Evaporation saturated temperature C Suction gas temperature C Suction superheating C Condensation saturated temperature C Delivery superheating C Liquid temperature C Subcooling C Circuit #2 Compressor load % No. fans enabled No. expansion valve steps (electronic only) Refrigerant/oil pressure Evaporation pressure Bar Condensation pressure Bar Oil pressure Bar Refrigerant temperature Evaporation saturated temperature C Suction gas temperature C Suction superheating C Condensation saturated temperature C Delivery superheating C Liquid temperature C Subcooling C External air temperature C Electrical measurements Analysis of the unit's voltage unbalance: Phases: RS ST RT V V V V V MAX AVG Unbalancing %: 100 = % V AVG AVG = average Compressor current - Phases: R S T Compressor #1 A A A Compressor #2 A A A Fan current: #1 A #2 A #3 A #4 A #5 A #6 A #7 A #8 A D - KIMAC EN - 62/68

63 Service and limited warranty Unless otherwise specifically agreed, all machines are factory-tested and guaranteed for 12 months as of the first startup or 18 months as of delivery. These machines have been developed and constructed to high quality standards, ensuring years of failure-free operation. It is important, however, to ensure proper and periodical maintenance in accordance with all the procedures listed in this manual. We strongly advise stipulating a maintenance contract with an authorised service centre to guarantee efficient, problemfree service, thanks tot he expertise and experience of our personnel. It must also be taken into consideration that the unit requires maintenance also during the warranty period. Consider that operating the machine in an inappropriate manner, beyond its operating limits or not performing proper maintenance according to this manual, can void the warranty. Observe the following points in particular, in order to conform to warranty limits: 1. The machine cannot function beyond the catalogue limits 2. The electrical power supply must be within the voltage limits and without harmonics or sudden changes. 3. The three-phase power supply must not have an unbalance between phases of more than 3%. The machine must stay turned off until the electrical problem has been solved. 4. No mechanical, electrical or electronic safety device must be disabled or overridden. 5. The water used for filling the water circuit must be clean and suitably treated. A mechanical filter must be installed at the point closest to the evaporator inlet. 6. Unless there is a specific agreement at the time of ordering, the evaporator water flow rate must never be above 120% or below 80% of nominal flow rate. D - KIMAC EN - 63/68

64 Compulsory routine checks and starting up pressurised devices The units are included in category IV of the classification according to European Directive PED 97/23/EC For chillers belonging to this category, some local regulations require a periodic inspection by an authorized agency. Please check with your local requirements. D - KIMAC EN - 64/68

65 Important information regarding the refrigerant used This product contains fluorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into the atmosphere. Refrigerant type: R134a GWP (1) value: 1300 (1) GWP = global warming potential The refrigerant quantity is indicated on the unit name plate. Periodical inspections for refrigerant leaks may be required depending on European or local legislation. Please contact your local dealer for more information. Disposal The unit is made of metal and plastic parts. All these parts must be disposed of in accordance with the local regulations in terms of disposal. Lead batteries must be collected and taken to specific refuse collection centres. D - KIMAC EN - 65/68

66 D - KIMAC EN - 66/68

67 D - KIMAC EN - 67/68

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